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| B层; 淀积层 | |||
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горизонт В : 16 phrases in 8 subjects |
| Drilling | 2 |
| Ecology | 2 |
| Electronics | 1 |
| General | 5 |
| Geology | 2 |
| Oil / petroleum | 2 |
| Sports | 1 |
| Technology | 1 |
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